Where is the transmission dip stick located on a 318 dodge pickup standard transmission?

A 1970s-era Dodge D100 (318 engine) with a standard transmission does not have a transmission dipstick. Manual transmissions don't typically use dipsticks; their transmission fluid level is checked through a fill plug (often requiring some specialized tools or methods) rather than a dipstick. You'll need to consult your owner's manual or a repair manual specific to your truck's year and transmission type to find the correct fill and check procedure.